brotherton-erpnext/erpnext/patches/v11_0/drop_column_max_days_allowed.py

from __future__ import unicode_literals

import frappe


def execute():
	if frappe.db.exists("DocType", "Leave Type"):
		if 'max_days_allowed' in frappe.db.get_table_columns("Leave Type"):
			frappe.db.sql("alter table `tabLeave Type` drop column max_days_allowed")